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ssive tags.Frequencies
Like all wireless communications, there are a variety of frequencies or spectra through which RFID
tags can communicate with readers. Again, there are trade-offs among cost, performance and
application requirements. For instance, low-frequency tags are cheaper than ultra high-frequency
(UHF) tags, use less power and are better able to penetrate non-metallic substances. They are ideal
for scanning objects with high water content, such as fruit, at close range. UHF frequencies
typically offer better range and can transfer data faster. But they use more power and ..................[:=> Show Contents <=:]

e field.
Often the antenna is packaged with the transceiver and decoder to become a reader (a.k.a.
interrogator), which can be configured either as a handheld or a fixed-mount device. The reader
emits radio waves in ranges of anywhere from one inch to 100 feet or more, depending upon its power
output and the radio frequency used. When an RFID tag passes through the electromagnetic zone, it
detects the reader's activation signal. The reader decodes the data encoded in the tag's integrated
circuit (silicon chip) and the data is passed to the host computer for processing.
2. TAGS (Transponde..................[:=> Show Contents <=:]

im Ankit Ravi doing Btech final yr...
im preparing a project on RFID BASED AUTOMATIC ATTENDANCE SYSTEM..
im not able to make the block diagram,class diagram and the DFDs for it......................[:=> Show Contents <=:]